I have got the code 0301 - Cylinder 1 misfire.
The car runs REALLY rough, at idle and when driving really missing and juddering - will not go much above 20mph?

Yet flick to LPG and its perfect!

So i was thinking maybe its an injector/fuel prob as this is the only part that is used on petrol everything. else would be common to LPG or gas?

Any ideas what could be causing this?

HELP!
Thanks